Means-for applying antioffset material to the freshly-printed sides of traveling webs



March 9 1926. 1,576,130

HUM. BARBER MEANS FOR APPLYING ANTIOFFSET MATERIAL TO THE FRESHLYPRINTED s s OF TRAVEggG WEBS Fil Jan. 31, l

Patented Mar. 9, 1926.

UNITED STATES PATENT OFFICE.

'nowann m. BARBER, E s'romn'e ron, coNnEcrrcU'r, Assxenon To c. is.COTTRELL & sons comm, or sronmczron, CONNECTICUT, A. CORPORATION orDELAWARE.

MEANS-FOB APPLYING ANTIoEEs ET MATERIAL TO THE EEEsnLY-ERmrEn sums I onTRAVELING WEBs.

Application filed January 81, 1924. .Serial No. 689,686.

To all whom it may concern:

Be it known that I, HOWARD M. BARBER, a citizen of the United States,and resident of Stonington, in the county of New Lon don and State ofConnecticut, have invented a new and useful Improvement in Means forApplying Antiofi'set Material to the Freshly-Printed Sides of TravelingWebs, of which the following is aspecification.

In printing presses where'slip sheets have been usedfor separating theprinted sheets in the pile to prevent offsetting and smutting, theprinted sheets have been delivered from the press with their freshly.printed sides up. It has been heretofore attempted to do away with theuse of the slip sheets by applying anti-offset material to the freshlyprinted side-0f the web or sheet. To pro-- duce the best results theanti-offset material when in liquid form must be depositedin a very thinand uniform film upon the freshly printed side of the web or sheet, for,if the anti-ofiset liquid is permitted to accumulate and drop onto saidweb'or sheet,

it will not only discolor the web or sheet but will cause the sheets tostick together, when stacked in a pile, because of the characterof theanti-oifset liquid used for this pur- P My present invention is directedto means for so printing the web that it may be readily led off from theprinting mechanism with its freshly printed side down, and so locatingthe anti-offset supply device under the web that the anti-offsetmaterial will be directed upwardly against the freshly printed side ofthe web; any excess material which mi ht accumulate in quantitiessufficient to orm drops, being caused to drop away from instead of ontothe web; the object being toprovide means whereby the best class ofcolor printing may be produced and the sheets stacked in piles withoutthe use of interposed slip sheets or the danger of oflsetting orsmutting. 1

A practical embodiment of my invention is re resented in theaccompanying drawing whic represents in diagram a multi-color rotary webperfecting printing press with my improvements applied thereto.

The printing mechanism for printing on one side of'the web 1 is hereinshown as arranged to print in two colors thereon, the

the winding roll 18 to take care of the impression cylinder beingdenoted by '2, the two form cylinders by 3 and 4: and their respectivegroups of inking rollers by 5 and 6. Y

' The printing mechanism for printing upon the opposite side of the weblisherein shown as arranged to print in four colors thereon, andcomprises the impression cylinder 7, the four-form cylinders 8, 9, 10,'11 and their respective groups ofinking rollers 12,13, 14 and 15. Theseform cylinders are located-around the underside of the impressioncylinder 7 so as to permit ready leading off of the web from theimpression cylinder-with the last freshly printed side" down. 4 I Anoffset web 16 leadsfrom the su ply roll 17, around the impressioncylinder to rst' freshly printed side of the web.

The means which I have shown fora ply ing. the anti-ofizset materialtothe last resh-. ly printed side of the web 1 is herein shown. ascomprising a reservoir 19 fora liquidanti-ofi'set material, saidreservoir being'located under the web and being provided with atomizingnozzles 20, 21,-the nozzle 21 being in communication with a source ofpressure, (not shown herein) through a supply pipe 22. Thus theanti-offset liquid will i e sprayed upwardly onto the last freshlyprinted side of the web in a thin even film as it is led off from theimpression cylinder 7 any accumulation of liquid at the nozzle or anyexcess supply being allowed to drop away from the web instead of ontothe web, thus preventing any liability of the, web becoming injured bysuch excess antiiofi'set liquid being dropped thereon. a It is obviousthat the anti-offset applylng device may be used in connection with theprinting of webs either 1n one or morecolors side down, and a devicelocated under said web for spraying an. anti-offset liquid.up wardlyagainst the freshly printed side of the web.

2. In a rotary web grew, means for printing successively upon otli'sides of the traveling web, means for leading off the web with the lastfreshly printed side down, and a device located un- 'der said web forspraying an anti-ofiset liquid upwardly against the last freshly printeds1de of the web.

3. In a mnlticolor rotary web perfecting printing press, means forprinting in multicolor upon one side of the traveling web, means forprinting in multi-color upon the other side of the traveling web,comprising an im ression cylinder and its coacting form cylin erslocated around the under side of the impression cylinder, means forleading off theweb with the last freshly printed side down, and a devicelocated under said web for spraying an anti-oflset liquid upwardlyagainst. the freshly. printed side of the web.

perfecting printing 7 'pression cylinder 4. In a multi-color rotaryprinting press, means for printing in multi-color on one side of thetraveling web, comprising an impression cylinder and its coacting formcylinders located around the under side of the impression cylinder,means for leading off the web with the freshly printed side down, andmeans for spraying an anti0fiset liquid upwardly against the freshlyprinted side of .the web.

, 5. In a multi-color rotary printing press, means for printing inmulti-color on one side of the traveling web, comprising an imand itscoacting form cyl indcrs located around the under side of the impressioncylinder, means for leading off the Web with the freshly printed sidedown, and a device located under said web for spraying an anti-offsetliquid upwardly against the freshly printed side of the Web. Intestimony, that I claim the foregoing as my invention, I have signedmyname this 29th day of January 1924.

HOWARD M. BARBER.

